Combined pipe and nut wrench.



No. 738,444. PATENTED SEPT. 8, 1903.

N A. W. HJORTH.

COMBINED PIPE AND NUT WRENCH.

APPLICATION FILED DBO. 11, 1902.

N0 MODEL.

WITNESSES INVEN'LOR Tm: Nou s PETERS m. mom-awe" wnmnm'on. n. c.

. wrenches.

Patented September 8, 1903.

UNITED STATES PATENT OFFICE.

ARTHUR W. HJORTH, OF JAMESTOWN, NEW YORK, ASSIGNOR TO WILLIAM HJORTH 6t COMPANY, OF J AMESTOWVN, NEW YORK, A COPARTNERSIIIP.

COMBINED PIPE AND NUT WRENCH.

SPECIFICATION forming part of Letters Patent No. 738,444, dated September 8, 1903. Application filed December 11,1902. erial No. 134,847. (No model.)

T0 at whom, it may concern.-

Be it known that I, ARTHUR W. HJORTH, a citizen of the United States, and a resident of Jamestown, county of Chautauqua, and State of New York, have inventeda new and useful Combined Pipe and Nut Wrench,of which the following, taken in connection with the ac companying drawings, is a full, clear, and exact description.

The invention relates to combined pipe and nut wrenches; and the object of my improvement is to provide a tong form of wrench in which the jaws are adapted to grip either a pipe or the nut of a bolt in a peculiar way, which I will now explain.

In the drawings, Figure 1 is a side elevation of my wrench engaging a piece of pipe. Fig. 2 is a like elevation engaging a nut. Fig. 3 is a side elevation of the wrench closed.

Similar numerals refer to corresponding parts in the several views.

My wrench is made in the common tong form, having the two parts 10 andll, with suitable handles 12 and 13. The two parts are united by a central rivet 14 and have the upper and underjaws 15 and 16. Underjaw 16 has the teeth or serrations 17, which jut forward slightly, the upper angle of which serrations must always be made on a straight line from the center of pin 14, as shown in dotted line, in order that the teeth shall bite the pipe and hold to the same when once contact has been made.

The upper jaw 15 is made with a bend 18,

which places the outer end of the jaw in a position almost in front of the serrations 17 on underjaw 16, much like the billof an eagle. My main improvement is the making of the outer end of jaw 15 wide and heavy, as shown, and the cutting of an angled opening 19 on the under side of said outer end and opposite serrations 17, so that the line of serrations 17 form the hypotenuse of a right-angle triangle. The upper side 20 of the Vfshaped opening 19 may be left smooth, as in Fig. 2, for small The outer side 21 shouldalways be serrated. I usually serrate both sides 20 and 21 in the larger wrenches, as shown in Fig. 1, since it gives me a stronger grip on the pipe. This is not needed in the work for which the small sizes are adapted, and the smooth side 20 is preferable for gripping nuts.

It is apparent that in applying my wrench posite from which the serrations 17 take hold and thatthe position of the outer nib 23 is such that it forms a sort of hook against which the under jaw braces when pressure is applied to upper handle 12. The teeth on face 21 hook inwardly in opposition to the teeth on face 17, which jut forward, as stated. It is obvious, therefore, that when once the pipe 22 is gripped by the wrench handles 12 and 13 do not need to be gripped together to hold onto the pipe, but that pressure applied to the upper handle 12 will grip the pipe more and more strongly and the. pipe may be turned by the pressure on the one handle 12, since the oppositeacting teeth are drawn by said pressure more and more firmly onto the pipe.

It will be observed that nut 24 is firmly embraced on two sides by the right-angled opening 19, and the opposite corner is held by one of the notches in the serrations 17. Nut 24 can now be easily turned by pressure on the one handle 12 for the same reason and in the same manner as above described in regard to pipe 22.

I am aware that my improvement is simple, but experimentally have found it vital to the successful operation of my wrench. Let it be noted that the sides 20 and 21 of the opening 19 and face 17 of the under jaw form when the wrench is closed substantially an equilateral triangle. It is apparent at once that this construction gives a biting grip on three sides of the pipe, as above described, and that any otherconstruction will not give the combined efficiency for bothpipe and nut work. Nib 23 is usually made longer than side 20 in order that it may shut down over the square end 25 of jaw 16, as shown in the closed wrench in Fig. 3. The longer nib 23 also gives a stronger hold upon the pipe and nut.

When the wrench is closed, it makes a smooth neat tool, which can be carried in the pocket without catching or tearing the clothing.

I claim as new 1. A combined pipe and nut wrench consisting of two pivotally-attached members M .Li

having handles and jaws, said jaws given a downward turn and the nib of the upper jaw extending over the. end of the under jaw to form a round outer end when closed, an angled opening in the under side of said upper jaw, and the faces of said angled opening and under jaw serrated and forming substantially an equilateral triangle when the wrench is closed.

2. In a combined pipe and nut wrench the two members 10 and 11 pivotally attached by rivet 14:, said members having the handles 12 and 13 and the downwardly-turned jaws 15 and 16, the nib 23 of the upper jaw extending over end 25 of the under jaw to form a round outer end when the wrench is closed,

Witnesses:

A. W. KETTLE, S. A. BALDWIN. 

